Green approach towards the facile synthesis of dihydropyrano(c)chromene and pyrano[2,3-d]pyrimidine derivatives and their biological evaluation
作者:Pradeep K. Paliwal、Srinivasa Rao Jetti、Shubha Jain
DOI:10.1007/s00044-012-0288-3
日期:2013.6
one-pot synthesis of heteroaryl-substituted dihydropyrano(c)chromenes and pyrano[2,3-d]pyrimidines has been developed. Reaction proceeds via initial Knoevenagel, subsequent Michael and final heterocyclization reactions of heteroaryl aldehyde, malononitrile, and barbituric acid/dimedone. Triethylammonium acetate acts as a green catalyst as well as reusable solvents for this reaction. Short reaction time
已开发出一种简单有效的一锅合成杂芳基取代的二氢吡喃并(c)色烯和吡喃并[2,3- d ]嘧啶的方法。反应通过最初的Knoevenagel,随后的Michael以及杂芳基醛,丙二腈和巴比妥酸/二甲酮的最终杂环化反应进行。乙酸三乙铵充当绿色催化剂以及该反应的可重复使用溶剂。反应时间短,环境友好的程序,可重复使用性和优异的产率是该程序的主要优点。所有合成的化合物对不同的微生物污渍均显示出良好的抗菌活性,但对癌细胞系没有活性。
Functionalized reduced graphene oxide as a useful and efficient base catalyst for the preparation of <scp>4<i>H</i></scp>‐pyran and pyran‐like tacrine compounds and their antibacterial activity
performance. In the next step, two pyran derivatives 1f and 1h were used to synthesize the corresponding pyran-like tacrine derivatives 3f and 3h via the reaction of cyclohexanone, aluminum trichloride in reflux of 1,2-dichloroethane as solvent. Antibacterial activity of several of the prepared compounds was assessed against Gram-positive and Gram-negative bacteria by well and disk diffusion techniques. The 4H-pyran